“Thus our duties to animals are indirectly duties to humanity.”
Part II, p. 213
Lectures on Ethics (1924)
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Immanuel Kant 200
German philosopher 1724–1804Related quotes

“It is our duty to help those who need help; but it cannot be our duty to make others happy,”
Vol. 2, Ch. 24 "Oracular Philosophy and the Revolt against Reason"
The Open Society and Its Enemies (1945)
Context: ... the attempt to make heaven on earth invariably produces hell. It leads to intolerance. It leads to religious wars, and to the saving of souls through the inquisition. And it is, I believe, based on a complete misunderstanding of our moral duties. It is our duty to help those who need help; but it cannot be our duty to make others happy, since this does not depend on us, and since it would only too often mean intruding on the privacy of those towards whom we have such amiable intentions.

On the rights embodied in the United Nations Charter of which he drafted the Preamble, as cited in Antony Lentin, 2010, Jan Smuts – Man of courage and vision, p. 144. ISBN 978-1-86842-390-3

“Human happiness and moral duty are inseparably connected.”

“It's my duty as a human being to be pissed off”
Source: subUrbia

Remarks by President Obama and Daw Aung San Suu Kyi of Burma in Joint Press Conference at Aung San Suu Kyi Residence in Rangoon, Burma on November 14, 2014 http://www.whitehouse.gov/the-press-office/2014/11/14/remarks-president-obama-and-daw-aung-san-suu-kyi-burma-joint-press-confe
Context: Our struggle for democracy has been carried out with a strong grasp on the principle of nonviolence. And also, we believe in the rule of law. So if you ask how do we propose to resolve all of these problems of violence between communities, between different ethnic groups, we've got to start with rule of law. People have to feel secure before they can start talking to one another. We cannot achieve harmony without security. People who feel threatened are not going to sit down and sort out their problems. So I would like to recommend, as the chair of the Rule of Law and Tranquility Committee -- don't forget that tranquility is also included -- that the government should look to rule of law. It is the duty of the government to make all our people feel secure, and it is the duty of our people to learn to live in harmony with one another.

“Duty is ours; consequences are God's.”
Though this was a favorite motto of Jackson, and reported as among his last words, it did not originate with him, and was used by others at least as early as in a speech by abolitionist John Jay (8 October 1856)
Misattributed